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An investigation of the regulation of BLIMP1 by the epstein-barr virus in B cells

Vrzalikova, Katerina (2011)
Ph.D. thesis, University of Birmingham.

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Abstract

BLIMP1 is a transcription factor that regulates plasma cell differentiation. In this thesis I explore the regulation of BLIMP1 by EBV and by the EBV oncogene, latent membrane protein-1 (LMP1). In chapter 3, I show that BLIMP1α is down-regulated following the infection of germinal centre (GC) B cells with EBV. I also show that the ectopic expression of LMP1, was sufficient to decrease BLIMP1α expression in these cells and was accompanied by a partial disruption of the BLIMP1α transcriptional programme, including the aberrant induction of C-MYC. In chapter 4, I show that the ectopic expression of BLIMP1α in EBV-transformed cells and in EBV-positive Burkitt’s lymphoma cells can induce the viral lytic cycle. Chapter 5 provides evidence that LMP1 drives a reciprocal regulatory loop in GC B cells involving BLIMP1α and C-MYC which ultimately leads to the activation of C-MYC and the repression of BLIMP1α. Finally, in chapter 6, I present preliminary evidence showing that the BLIMP1β isoform is up-regulated in EBV-transformed B cells and in Hodgkin’s lymphoma cells; an effect which appeared to be mediated by hypomethylation of the BLIMP1β specific promoter. In summary, my results suggest that EBV can subvert normal B cell differentiation by modulating expression of the different BLIMP1 isoforms. These effects appear to be important not only for the regulation of the viral lytic cycle in B cells, but also potentially for the block in differentiation characteristic of EBV-associated B cell lymphomas.

Type of Work:Ph.D. thesis.
Supervisor(s):Murray, Paul and Woodman, Ciaran and Vockerodt,, Martina
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:School Of Cancer Sciences
Subjects:R Medicine (General)
RC Internal medicine
RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Institution:University of Birmingham
ID Code:1666
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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